White grunt ( Haemulon plumierii ) has gained relevance as an alternative resource to fisheries off the northern coast of Yucatan Peninsula, however, knowledge its biology in region is scarce. Thus, order explore the reproductive H. , a total 355 specimens were caught with hand line and bait, from September 2015 November 2016 conduct histological analysis gonads. The sample was represented by 2...

The study is an attempt to evaluate the population characteristics and virtual analysis (VPA) of two invasive species (Oreochromis niloticus Oreochromis aureus) using FiSAT II software based on data collected from Garmat Ali River, Iraq. A total 4391 individuals (2727 O. 1664 were measured for length-frequency October 2019 September 2020. Length-weight relationships derived, indicating allometr...

The population parameters of Malabar trevally (Carangoides malabaricus) were studied in the Persian Gulf and Oman Sea from December 2016 to November 2017. 1030 specimens were collected. The fork length ranged from 14 to 34 cm, with average 25.60±3.52 cm. The total weight ranged from 60.4 to 534.5 g, with average 329.03±113.46 g. The asymptotic length (L∞) and growth coefficient (K) were 37 cm a...

The Blue Peacock Bass (Cichla piquiti), native to the Tocantins-Araguaia river basin of the Amazon system, was introduced into the basin of the Paranaíba River, Paraná River system. Cachoeira Dourada reservoir is one of a series of dams on the Paranaíba River in central Brazil, where this fish has become established. A study of its feeding spectrum, combined with information about its reproduct...

This paper analyzes the impact of a negotiated scheme and a generic reference price system in comparison to a simple copayment system in a vertical di¤erentiation model with switching costs. The duopolistic market structure with an o¤-patent brand-name drug competing in a Stackelberg-mode with a generic version is adopted from Merino-Castéllo 2003. Brand-name drug and generic version di¤er in p...

When firms form an alliance, it often involves one firm acquiring an equity stake in its alliance partner. Such an alliance lessens the competition, but induces knowledge transfer within the alliance. This paper explores oligopoly models that capture this important link between knowledge transfer and partial equity ownership (PEO). We consider an industry consisting of n + 2 firms, where firm 1...

The ambient interstellar environment of windand supernova-driven superbubbles strongly affects their evolution, but its properties are rarely well-determined. We have therefore obtained H I aperture synthesis imaging of the environment around three similar, optically-selected superbubble nebulae in the Large Magellanic Cloud. The resulting H I maps show that the ambient gas distribution around ...

The Haemulon plumieri is a typical reef-associated and tropical species found in warm and temperate waters of the Western Atlantic. Due to the large fishing effort directed to H. plumieri, the knowledge about its reproductive biology is essential for correct stock management and conservation. The aim of this study was to characterise reproductive biology with a focus on its seasonal variation o...

The catch per unit effort (CPUE), population structure, sex ratio, and reproductive aspects of the invasive blue crab Callinectes sapidus Rathbun were studied in Monolimni Lagoon adjacent coastal waters estuarine area Evros River (Northeast Aegean Sea, Eastern Mediterranean). CPUE varied both seasonally spatially; higher values recorded summer fall lagoonal stations characterized by shallow dep...